28191472 has 20 divisors (see below), whose sum is σ = 54781216. Its totient is φ = 14054400.

The previous prime is 28191467. The next prime is 28191517. The reversal of 28191472 is 27419182.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 3472 + ... + 8272.

Almost surely, 2^28191472 is an apocalyptic number.

It is an amenable number.

28191472 is a deficient number, since it is larger than the sum of its proper divisors (26589744).

28191472 is a wasteful number, since it uses less digits than its factorization.

28191472 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5176 (or 5170 counting only the distinct ones).

The product of its digits is 8064, while the sum is 34.

The square root of 28191472 is about 5309.5642005724. The cubic root of 28191472 is about 304.3494941713.

The spelling of 28191472 in words is "twenty-eight million, one hundred ninety-one thousand, four hundred seventy-two".